"use client";

import { useEffect, useMemo, useState } from "react";
import { useRouter } from "next/navigation";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import {
  Select,
  SelectContent,
  SelectGroup,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import { Calendar } from "@/components/ui/calendar";
import {
  Popover,
  PopoverContent,
  PopoverTrigger,
} from "@/components/ui/popover";
import type { ResultFilters } from "@/lib/form/admin-form-results";
import { Download, X, CalendarDays } from "lucide-react";
import { format, parseISO } from "date-fns";

function DateFilterPicker({
  label,
  value,
  onChange,
}: {
  label: string;
  value: string;
  onChange: (value: string) => void;
}) {
  const selected = value ? parseISO(value) : undefined;

  return (
    <Popover>
      <PopoverTrigger asChild>
        <Button
          variant="outline"
          data-empty={!selected}
          className="w-full justify-start text-left font-normal data-[empty=true]:text-muted-foreground lg:w-44"
        >
          <CalendarDays data-icon="inline-start" />
          {selected ? format(selected, "PP") : label}
        </Button>
      </PopoverTrigger>
      <PopoverContent className="w-auto p-0" align="start">
        <Calendar
          mode="single"
          selected={selected}
          onSelect={(date) => onChange(date ? format(date, "yyyy-MM-dd") : "")}
        />
        {selected && (
          <div className="border-t p-2">
            <Button
              type="button"
              variant="ghost"
              size="sm"
              className="w-full"
              onClick={() => onChange("")}
            >
              Clear date
            </Button>
          </div>
        )}
      </PopoverContent>
    </Popover>
  );
}

export function ResultsFilters({
  formId,
  filters,
  onFiltersChange,
}: {
  formId: string;
  filters: ResultFilters;
  onFiltersChange?: (filters: ResultFilters) => void;
}) {
  const router = useRouter();
  const [values, setValues] = useState(filters);
  const base = `/admin/form/${formId}/result`;

  const updateValues = (
    update: (current: ResultFilters) => ResultFilters
  ) => {
    setValues((current) => {
      const next = update(current);
      onFiltersChange?.(next);
      return next;
    });
  };

  const filterQuery = useMemo(() => {
    const params = new URLSearchParams();
    if (values.q) params.set("q", values.q);
    if (values.sort !== "submittedAt") params.set("sort", values.sort);
    if (values.direction !== "desc") params.set("direction", values.direction);
    if (values.edited !== "all") params.set("edited", values.edited);
    if (values.dateFrom) params.set("dateFrom", values.dateFrom);
    if (values.dateTo) params.set("dateTo", values.dateTo);
    return params.toString();
  }, [values]);

  const appliedQuery = useMemo(() => {
    const params = new URLSearchParams();
    if (filters.q) params.set("q", filters.q);
    if (filters.sort !== "submittedAt") params.set("sort", filters.sort);
    if (filters.direction !== "desc") params.set("direction", filters.direction);
    if (filters.edited !== "all") params.set("edited", filters.edited);
    if (filters.dateFrom) params.set("dateFrom", filters.dateFrom);
    if (filters.dateTo) params.set("dateTo", filters.dateTo);
    return params.toString();
  }, [filters]);

  useEffect(() => {
    if (onFiltersChange) return;
    if (filterQuery === appliedQuery) return;

    const timeout = window.setTimeout(() => {
      router.replace(`${base}${filterQuery ? `?${filterQuery}` : ""}`, {
        scroll: false,
      });
    }, 350);

    return () => window.clearTimeout(timeout);
  }, [appliedQuery, base, filterQuery, onFiltersChange, router]);

  return (
    <div className="flex flex-col gap-3">
      <div className="flex flex-col gap-2 lg:flex-row">
        <Input
          value={values.q}
          onChange={(event) =>
            updateValues((current) => ({ ...current, q: event.target.value }))
          }
          placeholder="Search name or Discord ID"
          aria-label="Search responses"
        />
        <Select
          value={values.edited}
          onValueChange={(edited: ResultFilters["edited"]) =>
            updateValues((current) => ({ ...current, edited }))
          }
        >
          <SelectTrigger className="w-full lg:w-40" aria-label="Edit status">
            <SelectValue />
          </SelectTrigger>
          <SelectContent>
            <SelectGroup>
              <SelectItem value="all">All responses</SelectItem>
              <SelectItem value="edited">Edited</SelectItem>
              <SelectItem value="unedited">Not edited</SelectItem>
            </SelectGroup>
          </SelectContent>
        </Select>
        <Select
          value={`${values.sort}-${values.direction}`}
          onValueChange={(value) => {
            const [sort, direction] = value.split("-") as [
              ResultFilters["sort"],
              ResultFilters["direction"],
            ];
            updateValues((current) => ({ ...current, sort, direction }));
          }}
        >
          <SelectTrigger className="w-full lg:w-44" aria-label="Sort responses">
            <SelectValue />
          </SelectTrigger>
          <SelectContent>
            <SelectGroup>
              <SelectItem value="submittedAt-desc">Newest first</SelectItem>
              <SelectItem value="submittedAt-asc">Oldest first</SelectItem>
              <SelectItem value="respondent-asc">Respondent A–Z</SelectItem>
              <SelectItem value="respondent-desc">Respondent Z–A</SelectItem>
            </SelectGroup>
          </SelectContent>
        </Select>
        <DateFilterPicker
          label="From date"
          value={values.dateFrom}
          onChange={(dateFrom) =>
            updateValues((current) => ({ ...current, dateFrom }))
          }
        />
        <DateFilterPicker
          label="Through date"
          value={values.dateTo}
          onChange={(dateTo) =>
            updateValues((current) => ({ ...current, dateTo }))
          }
        />
        <Button variant="outline" asChild>
          <a href={`${base}/export${filterQuery ? `?${filterQuery}` : ""}`}>
            <Download data-icon="inline-start" />
            CSV
          </a>
        </Button>
        {(values.q ||
          values.edited !== "all" ||
          values.sort !== "submittedAt" ||
          values.direction !== "desc" ||
          values.dateFrom ||
          values.dateTo) && (
          <Button
            variant="ghost"
            size="icon"
            className="self-start lg:self-auto"
            aria-label="Clear filters"
            asChild={!onFiltersChange}
            onClick={onFiltersChange ? () => updateValues(() => ({
              q: "",
              page: 1,
              sort: "submittedAt",
              direction: "desc",
              edited: "all",
              dateFrom: "",
              dateTo: "",
            })) : undefined}
          >
            {onFiltersChange ? (
              <X />
            ) : (
              <a href={base}>
                <X />
              </a>
            )}
          </Button>
        )}
      </div>
    </div>
  );
}